Eucliwood, also called Eu or Yuu for short, is a necromancer who brought Ayumu back to life to be her guardian and has been living with him since. She wears an armor that suppresses her abilities and doesn't talk because her power can make her every word spoken become reality. Instead she communicates to others by using note pad, which usually pertains to her appetite. Although seemingly emotionless and mute, it is shown that she cares deeply about her friends and other people, even Ayumu though she considers him to be her servant. She does not like the word "death" taken lightly especially since her powers can instantly take a person's life. Ayumu often daydreams about her speaking in a cutesy manner. She is voiced by a different seiyuu each week in the anime during Ayumu's fantasy: Season 1: Ep 1: Kotono Mitsuishi (三石 琴乃) Ep 2: Mika Kanai (かない みか) Ep 3: Tomoko Kaneda (金田 朋子 Ep 4: Yuuko Minaguchi (皆口 裕子) Ep 5: Satomi Koorogi (こおろぎ さとみ) Ep 6: Sakura Tange (丹下 桜) Ep 7: Yuki Matsuoka (松岡 由貴) Ep 8: Noriko Hidaka (日高 のり子) OVA 1: Fumi Hirano (平野 文) OVA 2: Aya Hisakawa (久川 綾) Season 2: Ep 1: Kikuko Inoue (井上 喜久子) Ep 2: Omi Minami (南 央美) Ep 3: Kimiko Koyama (こやま きみこ) Ep 4: Mariko Kouda (國府田 マリ子) Ep 5: Etsuko Kozakura (小桜 エツ子) Ep 6: Chisa Yokoyama (横山 智佐) Ep 7: Midori Tsukimiya (月宮 みどり) Ep 8: Shimamoto Sumi (島本 須美) Ep 9: Yui Horie (堀江 由衣) Ep 10: Rei Sakuma (佐久間 レイ)

Sir Integra Hellsing is a member of the Protestant Knights, the leader of the Hellsing Organization, and the current master of Alucard. Integra has a very collected attitude, rarely allowing her emotions to get in the way of business. However, she is sometimes prone to bouts of anger. As the Hellsing family is "on a mission from God," she values her duties to protect the United Kingdom, its Queen, and the Anglican Church above everything else. For her, failure is not tolerated, especially her own. She runs the Hellsing Organization with charisma and patriotism, and she is one of the few people who can stand up to the force of Alucard's personality and command his respect.